I have been going for two years for PTSD issues, and I get sick EVERY week on therapy day. It's general nervous stomach in the mornings (I have an afternoon appointment) and then l get, um, diarrhea and weak knees & arms. The nerves and fear is just....gripping. It's decreased a bit, but I don't think it'll ever completely go away for me. I always feel much better at the end of the session, though. Like I've been reassured my T won't hurt me.